File: declare and implement class CAutoBufferEx
File: replace CAutoBuffer usage with CAutoBufferEx, fixes memory allocation check
File: add 'LoadFile' function and copy code from FileUtils
CFile::LoadFile: replace ugly reference to pointer with CAutoBufferEx
FileUtils::LoadFile: replace implementation with call of CFile::LoadFile
CFile::LoadFile: add parameter to leave file open after load
[vfs] CFile/FileUtils::LoadFile: add maxAllowedSize parameter
[vfs] CFile::LoadFile: add doxy